Measurements of time-dependent CP asymmetries in B[superscript 0]-->D(*)[superscript +]D(*)[superscript -] decays

Abstract

We present new measurements of time-dependent CP asymmetries for B[superscript 0]-->D(*)[superscript +]D(*)[superscript -] decays using (467±5)×10[superscript 6] B[bar-over B] pairs collected with the BABAR detector located at the PEP-II B Factory at the Stanford Linear Accelerator Center. We determine the CP-odd fraction of the B[superscript 0]-->D(*)[superscript +]D(*)[superscript -] decays to be R[subscript ⊥]=0.158±0.028±0.006 and find CP asymmetry parameters S[subscript +]=-0.76±0.16±0.04 and C[subscript +]=+0.00±0.12±0.02 for the CP-even component of this decay and S⊥=-1.80±0.70±0.16 and C[subscript ⊥]=+0.41±0.49±0.08 for the CP-odd component. We measure S=-0.63±0.36±0.05 and C=-0.07±0.23±0.03 for B[superscript 0]-->D(*)[superscript +]D(*)[superscript -], S=-0.62±0.21±0.03 and C=+0.08±0.17±0.04 for B[superscript 0]-->D(*)[superscript +]D(*)[superscript -], and S=-0.73±0.23±0.05 and C=+0.00±0.17±0.03 for B[superscript 0]-->D(*)[superscript +]D(*)[superscript -]. For the B0→D*±D∓ decays, we also determine the CP-violating asymmetry A=+0.008±0.048±0.013. In each case, the first uncertainty is statistical and the second is systematic. The measured values for the asymmetries are all consistent with the standard model.